How to put a textbox above the repater in a page ?

How to put a textbox above the repater in a page ? like the one(the textbox besides Search string)  below 

 

but what I create a globals varaible Searchstring , and put it on the customer list page, but what I got is a lable, not a textbox.

 

 

anyone who knows how to do this ?  much appreciated...

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